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-rw-r--r--util/guest-random.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/util/guest-random.c b/util/guest-random.c
index 086115bd67..23643f86cc 100644
--- a/util/guest-random.c
+++ b/util/guest-random.c
@@ -38,7 +38,7 @@ static int glib_random_bytes(void *buf, size_t len)
}
if (i < len) {
x = g_rand_int(rand);
- __builtin_memcpy(buf + i, &x, i - len);
+ __builtin_memcpy(buf + i, &x, len - i);
}
return 0;
}